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// Useful string functions and so forth. This is a grab-bag file.
// You might also want to look at memutil.h, which holds mem*()
// equivalents of a lot of the str*() functions in string.h,
// eg memstr, mempbrk, etc.
// These functions work fine for UTF-8 strings as long as you can
// consider them to be just byte strings. For example, due to the
// design of UTF-8 you do not need to worry about accidental matches,
// as long as all your inputs are valid UTF-8 (use \uHHHH, not \xHH or \oOOO).
// Caveats:
// * all the lengths in these routines refer to byte counts,
// not character counts.
// * case-insensitivity in these routines assumes that all the letters
// in question are in the range A-Z or a-z.
// If you need Unicode specific processing (for example being aware of
// Unicode character boundaries, or knowledge of Unicode casing rules,
// or various forms of equivalence and normalization), take a look at
// files in i18n/utf8.
#include <string>
#include "base/port.h"
#include "fastmem.h"
namespace dynamic_depth {
// Returns whether str begins with prefix.
inline bool HasPrefixString(const string& str, const string& prefix) {
return str.length() >= prefix.length() &&
::dynamic_depth::strings::memeq(&str[0], &prefix[0], prefix.length());
// Returns whether str ends with suffix.
inline bool HasSuffixString(const string& str, const string& suffix) {
return str.length() >= suffix.length() &&
&str[0] + (str.length() - suffix.length()), &suffix[0],
} // namespace dynamic_depth